Right now would be a good time to check which bosses appear there, with the 1 AP event in the JP version. Once I've finished guilting everything in my inventory, I'll check out those sections. My teammates are investigating the other raid spawn points in the meantime (or at least they've told me they are, lol).

So I've spell-checked the info that I have (there were some really fun autocorrect changes in there). The mission information is quite accurate (and based on experience seems to be the same between the JP and NA versions), the rewards aren't listed out according to the Boss level, but they seem to be accurate ranges based on my experience. I'm not sure what the best way to display this information would be, or if it's something that would be better suited to a walkthrough or a guide rather than a Wiki.

Raiding info up to mission 350.

Omega Bosses don't spawn entirely randomly; they typically operate on a 'jump pattern', which is different for each stage. Known jump patterns are recorded below (n being 'normal', and O being 'Omega').

Behemoths missions (all Power targets): 1-34, 140-162

Omega Behemoth (Horn is Magic, Core is Power): 151, 160

151 n, n, O, n, n, O, O, n, O

160 O, O, O, n, O, n, O, n, O, O

Drops are as follows:

Behemoth: 3* and 4* Hueys until lvl 20, then Fauna medals start coming in every ten lvls. Mythril Stones and Mythril Gems are given as well

Omega Behemoth: 5* and 6* star Hueys with Fauna medals, Mythril crystals are dropped as well

Omega Venom Spiders (Core, Stinger and Middle Spider are Power, Left and Right Spiders are Magic): 312, 322, 326

312 n, n, O, n, n, O, n, n, O, n

322 n, O, n, O, n, O, n, O, n, O

326 Omegas spawn at random

Drops are as follows:

Venom Spider: 4* and 5* Moogles, Cheshire Cats, and Merlins up to lvl 20, then Cheshires are dropped and Fairy Godmothers are given. At lvl 50 Merlins are dropped and Yen Sids and Mickeys are given Mythral stones and gems are dropped as well

Omega Venom Spiders: 5* and 6* Moogles, Fairy Godmothers, Yen Sids and Mickeys, Mythril crystals are given as well